The erythropoietic effect of testosterone cyclopentylpropionate (TCP) was studied in normal, plethoric, nephreetomized and ureter‐ligated rats. The results of this study support the contention that TCP exerts its erythropoietic effect though the kidney by increasing REF production; thereby potentiating this organ to generate greater amounts of erythropoietin (EP) in response to normal and cobalt‐stimulated erythropoietic challenges. From the data, it is further concluded that TCP neither exerts a direct EP‐like effect on haemopoietic tissues nor potentiates the effect of preexisting endogenous EP. The present data does not negate the possibility that testosterone may interfere with the action of an inhibitor of erythropoiesis, possibly at the renal level.
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Rencricca et al. (1969) studied this question.
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